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SYSTEM RESET

V

DD

2.7 V

Min. 100 ns

Reset

RST

Operation

Unknown

DIR9001

Status

DIR9001

SLES198 – DECEMBER 2006

DEVICE INFORMATION (continued)

The DIR9001 reset function is controlled by and external reset pin, RST.

The reset operation must be performed during the power-up sequence as shown in Figure 4. Specifically, the

DIR9001 requires reset operation with a 100-ns period after the supply voltage rises above 2.7 V.

Figure 4. Required System Reset Timing

The state of each output pins during reset is shown in Table 1.

Table 1. Output-Pin States During Reset Period

CLASSIFICATION

PIN NAME

WHILE RST = L

BCKO

L

Clock

LRCKO

L

SCKO

L

Data

DOUT

L

AUDIO

L

BFRAME

L

CLKST

L

COUT

L

Flag and status

EMPH

L

ERROR

H

FSOUT0

L

FSOUT1

L

UOUT

L

Oscillation amplifier

XTO

Output

9

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